Sound: FNE

       Name: FNE                                                     [Show more]
       Type: Macro
   Category: Sound
    Summary: Macro definition for defining a sound envelope
    Context: See this macro in context in the source code
 References: This macro is used as follows:
             * Elite loader (Part 2 of 6) uses FNE


 The following macro is used to define the four sound envelopes used in the
 game. It uses OSWORD 8 to create an envelope using the 14 parameters in the
 I%-th block of 14 bytes at location E%. This OSWORD call is the same as BBC
 BASIC's ENVELOPE command.

 See variable E% for more details of the envelopes themselves.


MACRO FNE I%

 LDX #LO(E%+I%*14)      \ Set (Y X) to point to the I%-th set of envelope data
 LDY #HI(E%+I%*14)      \ in E%

 LDA #8                 \ Call OSWORD with A = 8 to set up sound envelope I%
 JSR OSWORD

ENDMACRO